270 
GUY C. ROBSON. 
which exhibited lipochrome in either condition in the blood, 
during the months December- April, 1910-1911 : 
Table I. 
December 
Normal <J 
per cent. 
22 
Number of 
observations. 
58 
Normal $ 
per cent. 
20 
Number of 
observations. 
50 
January 
24 
158 
25 
127 
February 
26 
116 
68 
122 
March 
17 
189 
68 
186 
April 
5 
97 
62 
181 
December 
Infected < 3 . 
30 
10 
Infected $ . 
66 
9 
January 
46 
30 
69 
33 
February 
50 
24 
70 
37 
March 
47 
17 
61 
31 
April 
23 
17 
42 
19 
We observe that the percentage increases in the normal 
female from a figure about the same as that of the normal 
male to one about twelve times as large, month for month ; 
and we observe that in the infected crabs the figures are 
considerably higher for male and female alike than in the 
case of the normal animals, e.g. in January those for the 
infected males are about twice as great as those of the normal 
male, and those for the infected females are over two and a 
half times as great as those of the normal females. Finally, 
the figures for the normal male decrease from their maximum 
(in February) to the low amount of 5 per cent. 
Now the winter months in the Gulf of Naples constitute the 
season for the active moulting of the young crabs. In those 
months we find, in crabs about to moult, not only the blood, but 
also the skin of the carapace and joints deeply coloured by 
the lipochrome. On the other hand, crabs that have moulted 
and show the soft fresh carapace of the stage succeeding a 
moult, invariably have colourless blood and skin. Again, 
the months February-April fall in the very height of the 
breeding season of Inachus, in the Gulf, and at that time we 
find along with the appearance of the bright orange-coloured 
